11.

18.

19.

20.

21.

22.

23.

24.

If the number of turns of an inductive coil is doubled and core length is quadrupled, other
parameters being the same, the inductance of the coil became :

(4) doubled (B) halved
(C) quadrupled (D) unchanged

Which one among the following is TRUE regarding the selection of working flux density in
transformer design?

(५) High flux density in the core results into the reduction in Core loss
‏بق‎ High flux density in the core results into an increase in Copper loss
(^) High flux density in the core results into high all day efficiency

(D) High flux density in the core results into saving in cost of iron

If the ratio of average charge voltage to average discharge voltage in a lead acid cell is 4/3,
the ratio of its Watt Hour efficiency to Ampere hour efficiency is :

ക 0.5 B) 43
(0 169 (D) None of the above

A three phase induction motor runs at 2% slip and its rotor frequency is 1Hz. Stator
frequency in Hertz is :

ക്ര 60 B) 50

ര 40 D) 20

To have a smooth, quite running of an induetion motor by reducing humming and to prevent
cogging, the technique used is called :

(4) Damping (B) Concentrating
{C) Skewing (D) None of the above

If the flux per pole of a shunt-wound DC generator is halved and the number of poles is
doubled, the generated e.m.f. at constant speed :

(ಕಿ) remains the same (B) doubled
(ര) is halved (D) none of the above

In dc generators, the winding used in a machine delivering low voltage, high current
1086 35 :
(4) progressive simplex wave winding (0) lap winding

(0 any type of wave winding (D) any of the above
Which among the following can support a synchronous motor in Starting :
(ക) Damper winding (B) Frequency divider
)© Interpole (0) All the above
5 030/2016

[P.T.O.]